Dresden 2011 – scientific programme
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DS: Fachverband Dünne Schichten
DS 42: Poster I: Progress in Micro- and Nanopatterning: Techniques and Applications (jointly with O); Spins in Organic Materials; Ion Interactions with Nano Scale Materials; Organic Electronics and Photovoltaics; Plasmonics and Nanophotonics (jointly with HL and O); High-k and Low-k Dielectrics (jointly with DF); Organic Thin Films; Nanoengineered Thin Films; Layer Deposition Processes; Layer Properties: Electrical, Optical, and Mechanical Properties; Thin Film Characterisation: Structure Analysis and Composition; Application of Thin Films
DS 42.33: Poster
Wednesday, March 16, 2011, 15:00–17:30, P1
Evaluation of Barrier Films for Organic Solar Cells Using an Electrical Calcium-Test — •Hannes Klumbies1, Sylvio Schubert1, Lars Müller-Meskamp1, Olaf R. Hild2, and Karl Leo1,2 — 1Institut für Angewandte Photophysik, Dresdner Innovationszentrum Energieeffizienz, TU Dresden, 01062 Dresden, Germany — 2Fraunhofer Institute for Photonic Microsystems, 01109 Dresden, Germany
In contrast to common solar cells based on silicon, organic solar cells have the potential to be cheap and flexible. The latter is especially important for mass-production (Roll-to-Roll-processing), mobile applications and low-cost, lightweight installations. However, flexibility poses a challenge for stable encapsulation of the organic solar cell to prevent it from degradation due to oxygen and water vapor. It is common agreement that the transmission rates for these species should be 1E-4 g/m^2*d or lower - four to five orders of magnitude below the rate of a typical polymer foil. Transmission rates that low are not only difficult to achieve but also difficult to measure. Ready-to-use commercial devices based on coulometry only reach a sensitivity of 5E-4 g/m^2*d.
In this work we use an electrical Ca-test as a sensor for water vapor and oxygen. Its sensitivity is in the range of 5E-5 g/m^2*d or better.
Furthermore we show water-vapour-transmission-rates achieved by different barrier layers on polymer-foil, e. g. sputtered oxides, and compare them with the rates achieved by bare polymer- and commercial barrier-foils.